Gentleman Friday is the day that any man of any etiquette, dresses as a gentleman. Acts more gentleman like than he would on a regular basis. Weather it be opens doors,be polite, or anything as long as on the day he acts as the proper gentleman would.

Girl 1: Did you see Pablo??? he looked and acted as a gentleman.
Girl 2: well its gentleman friday after all
Girl 1: i like Gentleman Friday *giggles*